EP0971051A1 - Dispositif pour renouveler la teinture ou vernis d'objets métalliques minces - Google Patents

Dispositif pour renouveler la teinture ou vernis d'objets métalliques minces Download PDF

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Publication number
EP0971051A1
EP0971051A1 EP98830419A EP98830419A EP0971051A1 EP 0971051 A1 EP0971051 A1 EP 0971051A1 EP 98830419 A EP98830419 A EP 98830419A EP 98830419 A EP98830419 A EP 98830419A EP 0971051 A1 EP0971051 A1 EP 0971051A1
Authority
EP
European Patent Office
Prior art keywords
lids
bath
machine according
electrophoretic
conveyor line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98830419A
Other languages
German (de)
English (en)
Inventor
Giacomo Borra
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP98830419A priority Critical patent/EP0971051A1/fr
Priority to US09/465,939 priority patent/US6264816B1/en
Publication of EP0971051A1 publication Critical patent/EP0971051A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/22—Servicing or operating apparatus or multistep processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G17/00—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface
    • B65G17/26—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface comprising a series of co-operating units, e.g. interconnected by pivots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G49/00—Conveying systems characterised by their application for specified purposes not otherwise provided for
    • B65G49/02—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid
    • B65G49/04—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction
    • B65G49/0409—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction specially adapted for workpieces of definite length
    • B65G49/0413—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction specially adapted for workpieces of definite length arrangements for conveyance through the bath
    • B65G49/0418—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction specially adapted for workpieces of definite length arrangements for conveyance through the bath chain or belt conveyors
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/02—Articles

Definitions

  • the present invention relates to a machine for the electrophoretic painting or varnishing of thin metal objects such as, for example, lids for food containers, comprising a tank for the electrophoretic-bath, extending along a longitudinal axis, a conveyor line for the metal objects, immersed in the tank for the electrophoretic bath, an electrode immersed in the bath, and a system of electrodes of opposite polarity to the electrode immersed in the bath.
  • thin metal lids are produced by blanking operations from thin metal sheets which are normally already painted or varnished.
  • "easy-to-open" metal cans are used. This term generally means metal cans the lids of which normally have a pull tab and a predetermined break line, and which can be opened without the need for additional tools.
  • the already-painted or varnished lids are cut on the surface which is to be the outer surface; this operation consequently creates a cracking or breakage of the film of paint or varnish on the cut portions, which are thus exposed.
  • the exposed portions of the cut lids have to be re-painted or re-varnished.
  • a known machine for the electrophoretic painting or varnishing of thin metal lids uses, as an anode unit, a thin, flexible element which bears on the rims of the edges of the lids to be painted or varnished which have been exposed by the blanking operation.
  • the lids to be painted or varnished travel in a horizonal position on a conveyor line for the lids and the flexible elements are moved at the same speed, maintaining contact with the lids throughout the period during which they pass through the electrophoretic bath.
  • the anode unit which consists of a wire or metal strip, follows an endless path with respective guides and drive pulleys.
  • the machine just described has a fairly important disadvantage; the wire constituting the anode is immersed in the electrophoretic bath, and is therefore covered with a large amount of paint or varnish which cannot be removed and which irreparably soils the guides and the drive means for the wire. Moreover, the wire constituting the anode is under tension along the entire endless circuit, causing well-known problems of premature wear of the guide and return elements owing to electrical erosion.
  • a further disadvantage of this machine is the system for transporting the lids.
  • the transportation of the lids in a horizontal position prevents perfect painting or varnishing since the oxygen which forms in the vicinity of the lower surface of the lid during anaphoresis remains incorporated under the lid, in addition to any air already trapped by the bell effect of the concave side of the lid which faces downwardly at the moment of immersion, thus creating an insulating cushion which partially prevents the deposition of paint or varnish on the metal object.
  • the tank for the electrophoretic bath has to have two openings for allowing the conveyor line for the lids to enter and leave the tank, respectively.
  • these two openings have to be below the level of the electrophoretic bath, thus causing a continual leakage of liquid.
  • the machine described above therefore requires a system for circulating the liquid which has leaked from the electrophoretic tank, thus increasing the structural complexity of the machine.
  • a further known machine for the electrophoretic painting or varnishing of thin metal objects comprises an anode system constituted by a metal conveyor chain having a plurality of appendages each of which is intended to contact a respective lid to be polarized. Only the appendages of the anode system are therefore immersed in the electrophoretic bath, preventing paint or varnish from being carried along by the wire.
  • a machine for the electrophoretic painting or varnishing of thin metal objects such as, for example, lids for food containers, comprising a tank for the electrophoretic bath, extending along a longitudinal axis, a conveyor line for the metal objects, immersed in the tank for the electrophoretic bath, an electrode immersed in the bath, and a system of electrodes of opposite polarity to the electrode immersed in the bath, characterized in that it comprises means for securing the metal objects, the securing means being able to keep the plane containing each metal object in a position substantially perpendicular to the direction of movement of the conveyor line for the lids.
  • the electrophoretic painting or varnishing machine comprises a rigid frame 1 containing a tank 2 for the electrophoretic bath, supported and movable vertically by means of a lifting fork 3.
  • the lids 4 to be painted or varnished electrophoretically are moved by means of a conveyor line 6 from a supply station 5 into the tank 2 for the electrophoretic bath in which they come into contact with an anode unit 7 comprising a plurality of polarizable resilient strips 10 traveling on a chain member 8 at the same speed as the lids.
  • the machine further comprises an ultrasound washing device 26 for cleaning the conveyor line 6, during its return stage, of any deposits caused by the deposition of electrophoretic liquid thereon.
  • the lids 4 to be painted or varnished are loaded onto the conveyor line 6 for the lids 4, in the supply station 5, by means of a conveyor belt 15, and are clamped by securing means 16.
  • the securing means 16 comprise pairs of lateral supports 17 each comprising a linear portion and an angled end, enabling the lids to maintain a position substantially perpendicular to the direction of movement of the conveyor line 6 for the lids throughout its path as far as the baking oven.
  • the conveyor line 6 for the lids 4 as a whole thus has flexibility characteristics which allow it to follow the path shown in Figure 1.
  • the conveyor line 6 comprises two chains 6a and 6b with hollow pins 21, the chains being movable parallel to one another and being supported by five pairs of pinions 23 (Figure 1) each comprising, as shown in Figure 4, a chain wheel 23a supported for rotation on a hub 23b.
  • the pairs of lateral supports 17 are fixed to the chains 6a and 6b, opposite and facing one another.
  • Each lateral support 17 comprises a plurality of channels 18 which extend and become narrower from the linear portion towards the angled end of the lateral support 17.
  • Each lateral support 17 also comprises, on the opposite side to the channels 18, two substantially hook-shaped appendages 20 which have an interaxial spacing substantially greater than that of the hollow pins 21 of the chains 6a and 6b and which, by virtue of this characteristic, can be inserted and snap-engaged in the hollow pins 21.
  • the securing means 16 are mounted on the chains 6a and 6b in a manner such that the plane in which the lids 4 are fitted in the channels 18 is substantially perpendicular to the direction of travel of the chains 6a and 6b.
  • the lateral supports 17 and the respective chains 6a and 6b may be held together by screws or by other known fixing means.
  • the lids coming from the conveyor belt 15 are fitted in sequence and in a synchronized manner in respective pairs of opposed channels 18, traveling on the conveyor line 6. Since the channels 18 become narrower at the angled end, they keep the lids clamped, ensuring their transportation even at high speed. Moreover, the angled ends of the channels 18 positively ensure that the lids 4 are clamped when they are in a vertical position, thus preventing them from falling into the electrophoretic bath.
  • the distance between the opposed lateral supports 17 may be varied in order to transport lids of different sizes.
  • the hubs 23b of each pair of pinions 23 are mounted coaxially on a pin 24 supported for rotation by the frame 1 of the machine and are associated with the pin by means of a male-and-female screw connection, one of the couplings having a right-hand thread and the other a left-hand thread.
  • the rotation of a hand wheel 25 associated with one end of the pin 24 enables the pinions to move along the pin symmetrically with respect to the median axis of the conveyor line 6, increasing or reducing the distance between the chains 6a and 6b.
  • the lids 4 coming from the supply station 5 to be painted or varnished contact the resilient strips 10 traveling on the chain member 8 at the same speed as the conveyor line 6 for the lids 4 and in synchronism therewith.
  • the resilient strips 10 are fixed in pairs to support blocks 9 of electrically non-conductive material with which the links of the chain member 8 are provided.
  • Each resilient strip 10 comprises a first end 10a for contacting an electrically-polarized, bar-like element 13 and a second end 10b for contacting a respective lid to be painted or varnished, moving on the conveyor line 6.
  • the polarization of the lids 4 by means of the resilient strips 10 takes place in four stages along a portion of the chain member 8.
  • This portion defines an operative pass of the chain member 8, which is parallel to the longitudinal axis of the electrophoretic-bath tank 2 ( Figure 1), and which is characterized by contact between the resilient strips 10 and the lids 4; during stage I, the end 10b of the resilient strip 10 progressively approaches the cut edge of the lid 4 and comes into physical contact therewith.
  • steps I and II the strip and the edge of the lid travel in contact whereas the end 10a of the resilient strip 10 remains free during stage I and comes into physical contact with the insulated end portion 13a of the polarized bar-like element 13 during stage II.
  • stage III which is again characterized by contact between the end 10b and the lid, the end 10a comes into physical contact with a first section of a sectional, polarized portion 13b of the electrically-polarized, bar-like element 13, thus allowing current to pass through the resilient strip 10, starting the electrophoresis.
  • stage IV the end 10a comes into contact with a portion 13c of the bar-like element 13 comprising a single polarized block.
  • the electrically-polarized bar-like element 13 extends parallel to the conveyor line 6 for the lids for at least a portion of the operative pass of the chain member.
  • the sectional, polarized portion 13b comprises a plurality (generally from 4 to 8) of sections which are electrically insulated from one another and each of which is intended to contact a single end 10a at a time, whereas the portion 13c of the bar-like element 13 comprises a single polarized block.
  • the first of the sections has a device 14 for monitoring the flow of current which proves that contact has taken place.
  • the monitoring device 14 is constituted by a calibrated resistor R connected in series between a direct-current voltage generator (not shown) and the sections (generally between the voltage-generator and the first section) of the sectional, polarized portion 13b of the electrically-polarized, bar-like element 13, and by an electronic circuit C connected in parallel with the resistor R.
  • the electronic circuit C may, for example comprise current transducers with photo-electronic couplers.
  • the current-flow is tested by reading the voltage drop between the terminals of the calibrated resistor R by means of the electronic circuit C. If no current is supplied in a position occupied by lids, the circuit will provide a warning, thus permitting identification of the non-painted or non-varnished lid which, if required, may be expelled automatically from the production line before entering the oven.
  • the machine of the present invention for the electrophoretic painting or varnishing of thin metal objects has many advantages in comparison with machines of the prior art:
  • the entire conveyor line for lids of the present invention has a certain flexibility by virtue of the structure of the securing means 16 in separate blocks and by virtue of the chains 6a, 6b, and can thus follow very varied paths, according to need.
  • This characteristic of the conveyor line for the lids is particularly advantageous since it enables the lids to be introduced into the tank for the electrophoretic bath from the rim of the tank ( Figure 1), thus eliminating the problem of the need to create two openings in the walls of the tank for the electrophoretic bath through which the conveyor line for the lids can enter and leave, thus avoiding the continual leakage of paint or varnish.
  • the anode unit of the present invention is polarized only in a well-defined portion of the anode conveyor line, that is, only whilst contact is maintained between the resilient strips and the respective lids.
  • the fact that the anode conveyor line is insulated at all of its points except during electrophoresis has the enormous advantage of protecting the anode conveyor line from elongation phenomena caused by premature wear due to electrical erosion of the elements such as chains, pulleys and guides.
  • the anode unit modified as described above, could also be applied to conventional machines for the electrophoretic re-painting or re-varnishing of thin metal objects, that is, to machines in which the conveyor system for the objects is similar to that described in the introductory part of the present description with reference to machines of the prior art. In this case, it will suffice to apply to the device small modifications which are within the normal capabilities of experts in the art.
  • an expert in the art may apply many modifications and variations to the above-described electrophoretic painting or varnishing machine without, however, departing from the scope of the invention.
  • the electrically-polarized, bar-like element 13 in a suitable manner relative to the chain member 8, it is possible to arrange for the contact between the end 10b of the strip 10 and the respective lid to be painted or varnished to take place simultaneously with the contact between the end 10a and the first section of the sectional, polarized portion 13b.
  • the contact between the end 10b of the strip and the respective lid to be painted or varnished may occur after contact has taken place between the end 10a and the first section of the sectional, polarized portion 13b.
EP98830419A 1998-07-09 1998-07-09 Dispositif pour renouveler la teinture ou vernis d'objets métalliques minces Withdrawn EP0971051A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP98830419A EP0971051A1 (fr) 1998-07-09 1998-07-09 Dispositif pour renouveler la teinture ou vernis d'objets métalliques minces
US09/465,939 US6264816B1 (en) 1998-07-09 1999-12-17 Machine for the electrophoretic re-painting or re-varnishing of thin metal objects

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP98830419A EP0971051A1 (fr) 1998-07-09 1998-07-09 Dispositif pour renouveler la teinture ou vernis d'objets métalliques minces
US09/465,939 US6264816B1 (en) 1998-07-09 1999-12-17 Machine for the electrophoretic re-painting or re-varnishing of thin metal objects

Publications (1)

Publication Number Publication Date
EP0971051A1 true EP0971051A1 (fr) 2000-01-12

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Application Number Title Priority Date Filing Date
EP98830419A Withdrawn EP0971051A1 (fr) 1998-07-09 1998-07-09 Dispositif pour renouveler la teinture ou vernis d'objets métalliques minces

Country Status (2)

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US (1) US6264816B1 (fr)
EP (1) EP0971051A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1205411A1 (fr) * 2000-11-13 2002-05-15 Wilhelm Steckelbach Dispositif modulaire pour le traitement en surface d'objets individuels
WO2002072284A2 (fr) * 2001-03-09 2002-09-19 Corima International Machinery S.R.L. Procede et machine destines a peindre des couvercles metalliques
WO2008096235A1 (fr) 2007-02-06 2008-08-14 Corima International S.R.L. Appareil pour peinture électrophorétique d'objets métalliques, en particulier des couvercles de contenants pour une utilisation alimentaire

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030052009A1 (en) * 2001-09-14 2003-03-20 Case Leo L. Method and apparatus for the bulk coating of components
US7252749B2 (en) * 2001-11-30 2007-08-07 The University Of North Carolina At Chapel Hill Deposition method for nanostructure materials
KR20050084226A (ko) * 2002-12-09 2005-08-26 더 유니버시티 오브 노쓰 캐롤라이나 엣 채플 힐 나노구조체 함유 물질 및 관련 물품의 조립 및 분류 방법
US20070014148A1 (en) * 2004-05-10 2007-01-18 The University Of North Carolina At Chapel Hill Methods and systems for attaching a magnetic nanowire to an object and apparatuses formed therefrom
US7455732B2 (en) * 2004-08-13 2008-11-25 Ppg Industries Ohio, Inc. Apparatus and systems for coating objects
CN107904648B (zh) * 2017-11-15 2019-09-24 安徽工程大学 一种机械零配件表面电泳喷漆预处理装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005000A (en) 1973-09-17 1977-01-25 National Can Corporation Electrocoating apparatus and method
EP0100427A1 (fr) 1982-07-29 1984-02-15 Verwaltungsgesellschaft Heinrich Neitz GmbH & Co. KG Transporteur d'articles de série, notamment couvercles d'emballage ou dispositifs de fermeture
US4576685A (en) 1985-04-23 1986-03-18 Schering Ag Process and apparatus for plating onto articles
US4731171A (en) 1985-05-02 1988-03-15 Schmalbach-Lubeca Ag Process for making a lid having a tear-away opening
WO1989010987A1 (fr) * 1988-05-06 1989-11-16 Service Tool Die & Mfg. Company Appareil de transport pour machines d'electrolaquage
WO1994025645A1 (fr) * 1993-04-30 1994-11-10 Co.Ri.Ma Societa' A Responsabilita' Limitata Machine a possibilites multiples d'utilisation conçue pour le revetement electrophoretique de couvercles en fer-blanc

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5472592A (en) * 1994-07-19 1995-12-05 American Plating Systems Electrolytic plating apparatus and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005000A (en) 1973-09-17 1977-01-25 National Can Corporation Electrocoating apparatus and method
EP0100427A1 (fr) 1982-07-29 1984-02-15 Verwaltungsgesellschaft Heinrich Neitz GmbH & Co. KG Transporteur d'articles de série, notamment couvercles d'emballage ou dispositifs de fermeture
US4576685A (en) 1985-04-23 1986-03-18 Schering Ag Process and apparatus for plating onto articles
US4731171A (en) 1985-05-02 1988-03-15 Schmalbach-Lubeca Ag Process for making a lid having a tear-away opening
WO1989010987A1 (fr) * 1988-05-06 1989-11-16 Service Tool Die & Mfg. Company Appareil de transport pour machines d'electrolaquage
US4908153A (en) 1988-05-06 1990-03-13 Service Tool Die & Mfg. Company Transport apparatus for electrocoating machines
WO1994025645A1 (fr) * 1993-04-30 1994-11-10 Co.Ri.Ma Societa' A Responsabilita' Limitata Machine a possibilites multiples d'utilisation conçue pour le revetement electrophoretique de couvercles en fer-blanc

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1205411A1 (fr) * 2000-11-13 2002-05-15 Wilhelm Steckelbach Dispositif modulaire pour le traitement en surface d'objets individuels
WO2002072284A2 (fr) * 2001-03-09 2002-09-19 Corima International Machinery S.R.L. Procede et machine destines a peindre des couvercles metalliques
WO2002072284A3 (fr) * 2001-03-09 2004-03-04 Corima Internat Machinery S R Procede et machine destines a peindre des couvercles metalliques
WO2008096235A1 (fr) 2007-02-06 2008-08-14 Corima International S.R.L. Appareil pour peinture électrophorétique d'objets métalliques, en particulier des couvercles de contenants pour une utilisation alimentaire
US8206559B2 (en) 2007-02-06 2012-06-26 Corima International S.R.L. Apparatus for electrophoretic painting of metal objects, in particular lids for containers for food use

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